Other
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...255l..39c&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 255, Apr. 1, 1982, p. L39-L43.
Other
32
Abundance, Globular Clusters, Horizontal Branch Stars, Milky Way Galaxy, Molecular Absorption, Stellar Spectra, Absorption Spectra, Carbon Monoxide, Color-Magnitude Diagram, Cyanogen, Metals, Stellar Magnitude, Stellar Structure, Variable Stars
Scientific paper
An infrared color-magnitude diagram for NGC 7006 and moderate dispersion digital optical spectra of eight of its members indicate a metal abundance of -1.5 dex with respect to the sun. However, the ratio of red to blue horizontal-branch stars is quite large and is what would be expected for a cluster of much higher metallicity. Molecular band strengths are determined for CO in four stars, and CH and CN in five stars, and it is found that none of these molecular bands are anomalously strong compared to the same molecular features in other globulars of similar metallicity but varying horizontal-branch type. This is contrary to the behavior predicted if the C, N, and O abundances are the 'second parameter' needed to explain anomalous horizontal-branch morphologies.
Cohen Judith Gamora
Frogel Jay. A.
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